[iOS Clean] Added dialogs UI support.

ios/clean/chrome/browser/ui/commands/dialog_commands.h

Index: ios/clean/chrome/browser/ui/commands/dialog_commands.h
diff --git a/ios/clean/chrome/browser/ui/commands/dialog_commands.h b/ios/clean/chrome/browser/ui/commands/dialog_commands.h
new file mode 100644
index 0000000000000000000000000000000000000000..1e602e6061bcd8daaa3f1d528f20b0e9df04bab2
--- /dev/null
+++ b/ios/clean/chrome/browser/ui/commands/dialog_commands.h
@@ -0,0 +1,20 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef IOS_CLEAN_CHROME_BROWSER_UI_COMMANDS_DIALOG_COMMANDS_H_
+#define IOS_CLEAN_CHROME_BROWSER_UI_COMMANDS_DIALOG_COMMANDS_H_
+
+// Command protocol for dismissing DialogConsumers.
+@protocol DialogDismissalCommands

[marq (ping after 24h), 2017/06/14 10:52:14]

Maybe just -DialogCommands, so if (as seems likely) we have a -showDialog ... 
command, it has a logical home.

[kkhorimoto, 2017/06/23 06:24:17]

I don't think there will be a |-showDialog| command, as the DialogCoordinator is
intended to be subclassed.  There might be commands in the future to show
specific types of dialogs, but they should be specific to the subclass rather
than the generalized dialogs support implemented by DialogConsumers.

+
+// Called to dismiss the dialog.  |buttonTag| is the tag of the DialogButtonItem

[marq (ping after 24h), 2017/06/14 10:52:14]

Commands shouldn't presume a particular UI implementation. I'm fine if there's
an opaque 'dialog identifier' that's used, but how it's generated, and what it
corresponds to in the UI (if anything) isn't part of the command definition.

Also, 'tag' should be reserved for its use in the UIView sense (an integer
identifier), so calling something a 'tag' that's an object type (id) is
confusing.

[kkhorimoto, 2017/06/23 06:24:17]

I changed tag to identifier and updated the comments to make them a little less
tightly coupled with UI assumptions.

+// corresponding to the button that dismissed the dialog, or nil if dismissed
+// programmatically.  |inputStrings| are the text field values, and are returned
+// in the same order as the text field items were provided to the consumer.
+- (void)dismissDialogWithButtonTag:(id)buttonTag
+                  userInputStrings:(NSArray<NSString*>*)inputStrings;
+
+@end
+
+#endif  // IOS_CLEAN_CHROME_BROWSER_UI_COMMANDS_DIALOG_COMMANDS_H_